By Vlado Damjanovski
Closed circuit tv (CCTV) is experiencing a jump in know-how utilizing electronic innovations and the web. the recent version of this high-level expert reference keeps the details that made the 1st version successful, together with the main points of CCD cameras, lenses, coaxial cables, fiber-optics, and method layout, however it is increased to hide all video compression recommendations utilized in the ever expanding collection of electronic video recorders (DVRs) on the market this present day. It additionally serves to explain the know-how of information networking. The theoretical part explains some of the compression recommendations, akin to MPEG-1, MPEG-2, JPEG, Wavelet, H.261/263, JPEG-2000, MPEG-4, and so forth. Networking is additionally a brand new and unknown quarter for plenty of CCTV installers and this can be defined in a new section.The problem of choosing the perfect procedure from this kind of wide array of latest applied sciences to be had in CCTV has been compounded via the arrival of DVRs. This re-creation of the booklet CCTV demystifies DVR expertise. -Covers fresh electronic video recorder (DVR) compression suggestions, snapshot caliber, measuring and networking-Fully illustrated with dozens of pictures, tables, checklists, charts, diagrams and instructions-Encompasses CCTV criteria for united states, Europe, and Australia
Read Online or Download CCTV, Second Edition: Networking and Digital Technology PDF
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Extra info for CCTV, Second Edition: Networking and Digital Technology
Of course, with the latter F-stop you would have a slightly narrower depth of field, but other than that the film will be correctly exposed too. Because of this “equality” of the amount of light with different exposure/F-stop combinations, photographic experts have advised an Exposure Value (EV) rating for the amount of light that can be measured by the camera light meters. We will not be going into detail of exactly how the light is measured inside the camera, as this would require a full book to cover all models, but in general there are “Averaging” light meters, “Spot” light meters, and “Multi-pattern” light meters.
This is an extraordinarily high F-number to be achieved by mechanical means (leaves shutter). The precision of the leaves’ movement is limited, and, more importantly, an unwanted optical effect called a Fresnel Edge Refraction becomes noticeable with small iris openings. This means that, in practice, very high F-stops cannot be achieved by using just mechanical methods. So, special optical neutral density (ND) ﬁlters are used to “help” the leaves shutter achieve high F-stops as required by the sensitive CCD chips.
With experiments and testing it has been found that the most a human eye can resolve is no more than 5 ~ 6 lp/mm (line pairs per millimeter). 3 m, as when we are reading a ﬁne text. This equates to a minimum viewing angle of about one-sixtieth of a degree (1/60°). So, 1/60º is considered the limit of angular discrimination for normal vision. We can use this minimum angular vision for better understanding and optimizing the psychophysiology of the viewing. A known viewing distance parameter, from the Monitors chapter later in the book (Chapter 6), recommends for CCTV viewing a distance of around seven times the monitor height.
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